Apple is likely to replace Hewlett-Packard (HP) as the global number one notebook vendor in 2012 if tablet PCs are included in the calculation of global notebook shipments, according to industry sources.

After several crappy sony/dell laptops i switched to HP. They are great so far. No problems at all. I run cpu intensive things like model checking. I even spilled beer on one of them. Still kicks! Though I have to admit Apple machines looks bullet proof! Somehow I don't like osx, sorry. So no apple for me.
On the matter, I think tablets are not laptops. They don't replace a laptop. I need my hp at work or when working; I cannot imagine working with my tablet, it would crash and burn when I model check. When at home not working, I can use my tablet for netflix.